Welcome to the Community. It would be my pleasure to answer any questions you may have with the reconciled transactions in QuickBooks Online.
You can edit a reconciled transaction through the register make minor changes as long as the account and amount stay the same. Changing the information on the account and amount fields will lead to an incorrect reconciliation balance.
Click the Gear icon.
Below YourCompany, click Chart of Accounts.
Choose an account.
Click View register.
Select a transaction.
There are several things you need to consider before performing this action. Please take time to read this through the article I recommend: